Description ThunderMax ECM Tuner 309-606 Softail models mounts in place of the factory ECM continuously self adjusting, properly tuning the motorcycles air/fuel ratio for all riding conditions – FEATURES: Highly advanced, stand-alone tuning system utilizes proprietary Autotune technology with wide-band oxygen sensors to deliver unmatched performance and rideability Comes 100% assembled, ready to install with no wire-cutting or splicing required Every degree and a half of throttle; every 256 RPM, there is a fueling point that is automatically adjusted Simply replace the factory ECM and oxygen sensors, load a map, and enjoy your new ride! More control and a smoother running engine with built in barometric sensor you never have to think about ambient air changes Wideband oxygen sensors constantly read the Air Fuel Ratio and give live, real time feedback to the ECM. That means, no “accepting” the changes made to the map, once you key off the changes are written Fully adjustable with our Thunder Max tuning software or can be used just by loading a base map ThunderMax ECM Tuner 309-606 is Made in the USA – NOTES: Because of possible clearance issues, some aftermarket exhaust systems may require modification or relocation of the O2 sensor port bungs – FITMENTS: 2025 Harley-Davidson Softail Fat Boy FLFB – – 2025 Harley-Davidson Softail Heritage Classic FLHC – – 2025 Harley-Davidson Softail Low Rider S FXLRS – – 2025 Harley-Davidson Softail Street Bob FXBB – – 2025 Harley-Davidson FXBR Breakout 117 – – 2025 Harley-Davidson FXLRS Low Rider S 117 – – 2025 Harley-Davidson FXLRST Low Rider ST 117 – – 2025 Harley-Davidson FLSTFI Fat Boy Gray Ghost – – 2025 Harley-Davidson Softail Low Rider ST FXLRST – – 2025 Harley-Davidson Softail Breakout FXBR – – – Low Price on ThunderMax ECM Tuner 309-606
